https://www.livescience.com/61890-what-is-chimerism-fused-twin.html
The woman, singer Taylor Muhl, has a condition called chimerism, meaning she has two sets of DNA, each with the genetic code to make a separate person. The rare condition can happen during fetal

https://www.babycenter.com/pregnancy/your-baby/strange-but-true-one-person-born-with-two-sets-of-dna-a-chim_10364937
Chimerism is a rare congenital condition involving one person having two different sets of DNA. There are a few instances when it can occur: when a fetus absorbs a vanishing twin during pregnancy, when fraternal twins trade chromosomes with each other in utero, or when someone has a bone marrow transplant. Sometimes chimera symptoms are visibly

https://www.healthline.com/health/chimerism
Twin chimerism A more extreme form of chimerism can occur when a pair of twins is conceived and one embryo dies in the womb. The surviving fetus may absorb some of the cells of its deceased twin.

https://en.wikipedia.org/wiki/Chimera_%28genetics%29
Two-colored rose chimera. A genetic chimerism or chimera (/ k aɪ ˈ m ɪər ə / ky-MEER-ə or / k ɪ ˈ m ɪər ə / kim-EER-ə) is a single organism composed of cells with more than one distinct genotype.In animals and human chimeras, this means an individual derived from two or more zygotes, which can include possessing blood cells of different blood types, and subtle variations in form ().

https://time.com/4091210/chimera-twins/
If it was a parent-child relationship, you would see 50% of the DNA related. If it is an uncle to a niece or nephew, it's 25% related. This man and his son were 25% related.". It turned out

https://www.sciencealert.com/tetragametic-chimerism-embryos-multiple-births
It was while investigating an illness in her early teens that Muhl discovered both her allergies and unusual birthmark were the result of tetragametic chimerism between her own fertilised egg and that of a fraternal twin. Such mismatched sets of genes can make themselves known in a number of other ways. Where chimerism involves contrasting sex

https://www.discovermagazine.com/the-sciences/could-you-be-a-human-chimera-when-one-person-has-two-sets-of-dna
These twin scenarios may sound extraordinary, but there are even more routine ways to gain a second set of DNA. When a woman is pregnant with just one child, either (or both) of them may become chimeric if their respective cells cross the placental barrier that separates mother and fetus. These stowaways can enter the other's bloodstream, travel to distant organs, and establish themselves

https://embryo.asu.edu/pages/case-lydia-fairchild-and-her-chimerism-2002
The documentary "The Twin Inside Me," which first aired in 2006, documents a firsthand account from Fairchild and her family. It examines the extent of the legal and biological questions raised by an example of legal guardianship being threatened by genetic evidence in the case of a chimeric woman.

https://en.wikipedia.org/wiki/Lydia_Fairchild
Lydia Fairchild (born 1976) is an American woman who exhibits chimerism, having two distinct populations of DNA among the cells of her body. She was pregnant with her third child when she and the father of her children, Jamie Townsend, separated. When Fairchild applied for enforcement of child support in 2002, providing DNA evidence of Townsend

https://www.webmd.com/children/what-is-chimerism
The term chimera is usually associated with Greek mythology. It brings to mind a monster with the head of a goat and a lion. Instead of a tail, it has a protruding snake. There is a genetic term

https://www.scientificamerican.com/article/3-human-chimeras-that-already-exist/
A 2015 study suggested that this happens in almost all pregnant women, at least temporarily. The researchers tested tissue samples from the kidneys, livers, spleens, lungs, hearts, and brains of

https://www.businessinsider.com/what-is-a-human-chimera-and-how-does-it-happen-2017-11?op=1
Genetic experts believed he was a human chimera, and he had absorbed some of his DNA from a fraternal twin's embryo, BuzzFeed reported. A woman named Karen Keegan wound up in a similar situation

https://science.howstuffworks.com/life/genetic/chimerism-be-own-twin.htm
It occurs when two eggs (ova) are each fertilized by a separate sperm (spermatozoa). Then, the fertilized eggs, called zygotes, fuse to create a single organism with two genetically distinct types of DNA. As the embryo's cells multiply and grow, so do the two different types of genetic material. The result is a baby who is born a chimera.

https://www.thetech.org/ask-a-geneticist/articles/2020/are-chimeras-increased-risk-any-diseases/
Confirmed cases of twin chimerism are very rare, with only 100 identified worldwide. So right now, not much is known about the health effects (if any) in this type of chimera. At this point, disease has mostly been implicated in another type of chimerism: microchimerism. Microchimerism from pregnancy. Mothers are a tiny bit chimeric!

https://www.buzzfeednews.com/article/carolinekee/this-woman-has-chimerism-two-sets-of-dna
Chimerism is a rare genetic condition where an individual has two sets of DNA. Last year, musician Taylor Muhl learned that the unique birthmark on one side of her torso wasn't just skin deep. It actually is an outward sign of the fact that she is her own twin and carries two sets of DNA. Twins often have an inseparable bond, but Muhl and her

https://www.scienceabc.com/humans/what-is-a-human-chimera.html
A human chimera is a person containing cells that have a different genetic makeup. Hollywood TV shows have a few examples of chimerism. On Grey's Anatomy, an adolescent is found to be a hermaphrodite and a chimera when a tumor she harbors happens to be the testes of a vanished twin. In House, doctors take up the case of a boy formed through

https://en.wikipedia.org/wiki/Human_chimera
A human chimera is a human with a subset of cells with a distinct genotype than other cells, that is, having genetic chimerism. In contrast, an individual where each cell contains genetic material from a human and an animal is called a human-animal hybrid, while an organism that contains a mixture of human and non-human cells would be a human

https://www.womenshealthmag.com/health/a18754259/chimerism/
One woman knows exactly what that feels like—she has chimerism, a rare genetic disorder in which someone has two sets of DNA. Singer and model Taylor Muhl first opened up about her condition

https://www.aboutgeneticcounselors.com/Resources-to-Help-You/Post/chimerism-explained-how-one-person-can-unknowingly-have-two-sets-of-dna
Now at 33 years old, Muhl, a musician and model, understands her two-toned skin is actually a result of a genetic condition called chimerism, which causes an individual to have two genomes, or sets of DNA. Chimerism occurs when a woman is pregnant with twins and one embryo dies, and the other embryo absorbs the twin's cells.

https://www.britannica.com/science/twin-chimera
Other articles where twin chimera is discussed: chimera: …during development, two individuals, or twin chimeras, one or both of whom contain two genetically distinct cell populations, are produced. The most widely known examples of twin chimerism are blood chimeras. These individuals are produced when blood anastomoses (connections) form between the placentas of dizygotic twins, thereby

https://medicover-genetics.com/genetics-of-chimerism-being-your-own-twin/
Twin chimerism, also known as blood chimerism or transfusion chimerism, is caused by transfer of cells between dizygotic twins via fused placentas. Microchimerism. It is known that fetal cells can pass the placental barrier. This fact has been exploited for the development of non-invasive prenatal tests (NIPT), a prenatal test using cell-free

https://www.youtube.com/watch?v=TH2qlVFvKvs
The nightmare began when Lydia Fairchild was told the children she had given birth to could not possibly be her own. Lydia's fight to prove that she was the

https://www.nejm.org/doi/full/10.1056/NEJM199801153380305
High rates of successful pregnancy after in vitro fertilization depend on placing more than one embryo into the mother, a practice resulting in a 30-to-35-fold increase in dizygotic-twin deliveries